For what it's worth, when it's time to adjust Gottlieb relays, I get out my magnifying glasses, a couple strong lights, a small piece of white paper, my Dremel tool and switch bender, and go at it methodically. I usually unscrew the switch stacks one at a time (unless they're wired together), get my Dremel brush in there to really get those contacts shiny, then put it back together, tighten the stack screws, examine the tabs for shorts/bad solder joints. Then while manually moving the armature up and down, I watch the contacts really carefully with my magnifying glasses on, a slip of white paper behind the switches, and a bright light (on the paper, not on the switches), I can easily see if the contacts are touching and sliding past one another slightly, then opening, or vice versa. It takes some time, but if I'm really careful about it, I don't have much trouble with them once I'm done.
As dgAmpGuy said, those AX, BX, CX relays are about the worst since there's so little movement on the armature, but even those - once you get them dialed in, they work for quite a while. And getting to some of those stacks on the bottom/back of the score motor is a pain...
I do some work for a local arcade here in town repairing the EM pins and rifle games, and after I've gone through those switches like that, we don't have much trouble with the EM's...they're mostly Gottliebs and once you get the switches cleaned and gapped, they're tanks. The SS pins on the other hand....
You'll get this - just look at everything really closely and be patient.
I only got to play a Top Card once - really liked it much better than I thought I would just looking at the playfield...clever ruleset! I enjoyed trying to get those pop bumpers lit up!